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diff --git a/dom/media/mediasource/test/test_ChangeType.html b/dom/media/mediasource/test/test_ChangeType.html
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+++ b/dom/media/mediasource/test/test_ChangeType.html
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+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: changeType allow to change container and codec type</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(function(ms, el) {
+  el.controls = true;
+  once(ms, "sourceopen").then(function() {
+    // Log events for debugging.
+    const events = ["suspend", "play", "canplay", "canplaythrough", "loadstart", "loadedmetadata",
+                    "loadeddata", "playing", "ended", "error", "stalled", "emptied", "abort",
+                    "waiting", "pause", "durationchange", "seeking", "seeked"];
+    function logEvent(e) {
+      info("got " + e.type + " event");
+    }
+    events.forEach(function(e) {
+      el.addEventListener(e, logEvent);
+    });
+
+    ok(true, "Receive a sourceopen event");
+
+    const videosb = ms.addSourceBuffer("video/mp4");
+    if (typeof videosb.changeType === "undefined") {
+      info("changeType API is not available");
+    }
+
+    el.addEventListener("error", e => {
+      ok(false, "should not fire '" + e.type + "' event");
+      SimpleTest.finish();
+    });
+    is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+    const loadedmetadataPromises = [];
+    loadedmetadataPromises.push(fetchAndLoad(videosb, "bipbop/bipbop", ["init"], ".mp4"));
+    loadedmetadataPromises.push(once(el, "loadedmetadata"));
+    Promise.all(loadedmetadataPromises)
+    .then(function() {
+      ok(true, "got loadedmetadata event");
+      const canplayPromises = [];
+      canplayPromises.push(once(el, "loadeddata"));
+      canplayPromises.push(once(el, "canplay"));
+      canplayPromises.push(fetchAndLoad(videosb, "bipbop/bipbop", range(1, 3), ".m4s"));
+      return Promise.all(canplayPromises);
+    })
+    .then(function() {
+      ok(true, "got canplay event");
+      el.play();
+      videosb.timestampOffset = el.buffered.end(0);
+      return fetchAndLoad(videosb, "bipbop/bipbop_480_624kbps-video", ["init"], ".mp4");
+    })
+    .then(fetchAndLoad.bind(null, videosb, "bipbop/bipbop_480_624kbps-video", range(1, 3), ".m4s"))
+    .then(function() {
+      videosb.timestampOffset = el.buffered.end(0);
+      try {
+        videosb.changeType("video/webm");
+      } catch (e) {
+        ok(false, "shouldn't throw an exception");
+        SimpleTest.finish();
+        throw e;
+      }
+      return fetchAndLoad(videosb, "bipbop/bipbop_300-3s", [""], ".webm");
+    })
+    .then(function() {
+      ms.endOfStream();
+      return once(el, "ended");
+    })
+    .then(function() {
+      ok(el.currentTime >= el.buffered.end(0), "played to the end");
+      SimpleTest.finish();
+    });
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>